Of interest to me regarding Roblox is that it's been around for a long time - public release in 2006, almost 20 years ago! It was around when I was a kid, and I vaguely remember being aware of it and thinking it was dumb (certainly, I didn't know anyone who played it).
I wonder what happened to make it so popular in the present day. Was it incremental improvement, or a better fit with modern devices/culture; maybe simply being free to play?